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Conference ssag::ask_ssag

Title:	Ask the Storage Architecture Group
Notice:	Check out our web page at http://www-starch.shr.dec.com
Moderator:	SSAG::TERZAN

Created:	Wed Oct 15 1986
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	6756
Total number of notes:	25276

6572.0. "Power and heat dissipation of RZ29-VA." by CHEFS::TREVENNOR_A (A child of init) Fri Apr 11 1997 06:40

    can anyone tell me the DC power consumption and heat dissipation
    figures for an RZ29-VA in the following states:
    
    1) Power up and seeking continuously (ie heavy operation).
    2) Powered up and spinning not not being accessed.
    3) Powered up but not spinning (ie Adaptec power saving on).
    
    
    We have built RZ29 into PC kiosk systems and want to know if - when
    air-con is off in early morning - if we can leave it all running
    without undue heat build-up by spinning down the unit between certain
    hours of the day.
    
    
    Thanks!
    Alan T.

T.R	Title	User	Personal Name	Date	Lines
6572.1		SSDEVO::INDERMUEHLE	Stonehenge Alignment Service	`Fri Apr 11 1997 08:57`	22
	Hi Alan, Someone in engineering may have some numbers lying around, but I can't seem to find any power consumption numbers other than "idle" which means spinning with no seek other that cyclic recal/diag. This is 12w, which roughly comes out to 50 BTU/hr. This is about half again hotter that a 2GB drive at 8.8w or 39 BTU/hr. Hope this is of some help. Keep in mind that the spinning platters is what generates the heat. Though the seek activity does generate some heat, it is very little compaired to rotation. Therefore, if spin-down powersaver is an option, you should use it if 50 BTU's is a problem. Regards, John I.
6572.2	I'll let you figure out CFM and BTU needs ;^)	SUBSYS::VIDIOT::PATENAUDE	Ask your boss for ARRAY's...	`Fri Apr 11 1997 10:45`	24
	For a 8bit Single Ended drive.. +5 (+/-5%) +12 (+/-5%) Avg Wattage Max Operating Current 1.13A 0.95A 17.05W Avg Idle Current 0.66A 0.78A 12.66W For a 16bit Single Ended drive.. +5 (+/-5%) +12 (+/-5%) Avg Wattage Max Operating Current 0.90A 0.95A 15.90W Avg Idle Current 0.61A 0.78A 12.41W I don't have the not_spinning values. The base disk has a max ambient operating range temp of 50C The disk in an SBB has a max operating range temp of 30C That should get you started. Keep in mind, exceeding that temps, derates the MTBF of the device and causes neat thing like head crashes and data loss. Roger.
6572.3	Thanks and......	CHEFS::TREVENNOR_A	A child of init	`Tue Apr 15 1997 11:52`	10
	Thanks folks. By the way (.1) Leave Stonehenge alone. I go past it every morning on my way to work and it really doesnt need re-aligning. It pulls in lots of nice foreign currency as it is! 8-) Rgds Alan Trevennor Digital UK
6572.4	Chuckle, chuckle!	SSDEVO::INDERMUEHLE	Stonehenge Alignment Service	`Wed Apr 16 1997 14:46`	14
	Hi Alan, I've had that as my "personal_name" since dirt was young and I was in the the original CSSE many moons ago. It's perfectly harmless. I don't even own any heavy equipment, other than a 9 gig drive. Regards, John I